The loan is repayable, through the tax system, once your income reaches the income repayment threshold, currently $55,874 for the 2017-18 financial year. It can also be paid through voluntary repayments.
People who move overseas and have a Trade Support Loan debt are obliged to make compulsary repayments on their loan if their Australian and foreign-sourced income is above the income threshold ($55,874 for 2017-18)
People with a Trade Suppot Loan debt who leave Australia and intend to be overseas for more than six months, or who have already been overseas for six months, will be required to notify the Australian Taxation Office of their new contract details by simply creating a myGov account, linking to ATO online services and selecting 'update your details'.
People who move overseas will need to use their ATO online account to lodge an assessment of their worldwide income. Further information is available from the Australian Taxation Office website.